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Lennox GHR 26 HX warranty?

I have a guy at work working on one, in a weird twist of fate it's my brothers new rental that he may buy (he is in Afghanistan). The ps switch opens right on ignition, vent is clear, says it smells bad. Without mod and ser I suppose it's hard to say but wondering If anyone knows if HX is under warranty?

Lifetime warranties will revert to 20 years if the original buyer sells the house.
Honestly, replacing the whole unit is probably best. Those furnaces are not the best.
If you do just replace the HX make sure you tilt the furnace foreward to aid in proper drainage

Those furnaces had an issue with the cold end header box. Might wanna check that first.

I have dealt with that before too, when I had the issue the ps switch wouldn't close at all. He is going back again to check into that I think. We told the HO replacement Wouk be a good option but being a rental they just want whatever us cheapest.